Well I made my canon have a tire valve for propane injection. And I was wondering if I can pumpe extra air in too to Mix the air. But if it isn't too much of a deal ill just shot it without a fan. If it doesn't work ill cut the camber off and put in a fan and add a coupler with a screw on cap in the rear

I had a propane cannon running 100mm X400 combustion chamber and can tell you the difference between operating a chamber fan with and without is HUGE! even from dry firing you could tell that you were getting a more complete mix- the death of that cannon actually came from the fuel air becoming too efficient and self destructing in operating. fired off a good 100 odd golf balls before it stress failed

Ziptietech wrote:Well I made my canon have a tire valve for propane injection. And I was wondering if I can pumpe extra air in too to Mix the air. But if it isn't too much of a deal ill just shot it without a fan. If it doesn't work ill cut the camber off and put in a fan and add a coupler with a screw on cap in the rear

In either case, adding air will throw the fuel mixture off. If you let the air escape, you just need to aim high. If you don't allow the air to escape, you have built a hybrid, which will require a burst disk or some other valve (and probably shouldn't be made out of PVC)

They do sell some very small PC fans that could probably fit through the 1/2" ball valve, but making connections and securely mounting it would be a pain.

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POLAND_SPUD wrote:even if there was no link I'd know it's a bot because of female name

A fan doesn't make that much difference IF the fuel is well mixed. The fan just helps to mix the fuel faster. If you are patient the gun'll work fine. After fueling wait a couple minutes before firing to give the fuel time to properly mix with the air in the chamber.

Yeah, the fan is just there to increase efficiency of the fuel, so that it fills every cubic centimeter of your combustion chamber for maximum power. It will definitely work without it though, I don't have one, and I get a pretty powerful punch when I hit the igniter.